What is the correct punctuation to follow an interjection in a sentence? A period
B question mark
C question mark or a comma, depending on the contextual intensity of the
interjection.
D exclamation mark or a comma, depending on the contextual intensity of
the interjection.

exclamation point

Explanation:

interjections are only one or two words. Interjections can stand alone as their own sentences and are often followed by an exclamation point. They can also be used at the beginning or in the middle of other sentences.

my dad purchased natural colorings in a specialty store